How to Hook Up Your Furnace Vents

Furnace ducts and vents connect a home’s heating and cooling system to its interior living spaces. The proper hook-up of room vents helps ensure living spaces receive adequate amounts of airflow. Each room vent connects to a duct line that runs from the main heating and cooling unit. Room vent sizes may vary depending on the size of the incoming duct line.

Tape measure
Power drill with ¾-inch drill bit
Phillips washer tap screws, ¾-inch

Instructions

- 1
  Measure the length and width of each room’s duct openings to determine the vent sizes needed. The size listed on a vent corresponds with the size of the intended duct opening, so no additional calculations are needed to match vent size to duct openings.
- 2
  Slide the furnace vent into the duct opening hole. Unevenly cut openings may require a different-sized vent depending on how far off the dimensions are. In some cases, it may be possible to round down to the next available vent size to get a better fit.
- 3
  Secure the furnace vents inside the duct openings with screws. Position the vent over the top of the duct opening, and drill ¾-inch holes at each corner of the vent so that the holes go through the floorboard. Use ¾-inch Phillips washer tap screws to secure the vent to the floor.
- 4
  Check to make sure vent doors open and close properly. Tight vent doors may indicate an improper fit or may simply need lubricating.

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